8.3. Numerical objects
In Ruby, numbers are objects. You can send messages to them, just as you can to any object:
As you’ll see if you run this code, floating-point numbers know how to round themselves 
(up or down). Numbers in general know 
whether they’re zero. And integers can convert themselves to the character that corresponds to their ASCII value .
Numbers are objects; therefore, they have classes—a whole family tree of them.
8.3.1. Numerical ...
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